Speedometer issue

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Joedetroit84

Active member
Joined
Dec 3, 2016
Posts
25
I have a 2000 Tiffin Allegro Class A.  We've been on a cross country trip for the last 10 days. Two days ago I started the RV and drove away and noticed the speedometer indicator was bouncing back and forth from 0-50 and the over drive light on the shifter was blinking. I stopped the vehicle and shut it down in a parking lot. A few minutes later I started it and drove away and everything was back to normal. This has been happening every now and then for the last two days.  any ideas??
 
My first guess would be a soon to fail speed sensor(VSS). Easy fix. Usually 1 bolt and a wire connection. Second guess would be a wiring problem from VSS to ecm. Sometimes those wires get too close to exhaust on some vehicles.
 
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